Abdullah bin Dinar (may Allah have mercy on him) says that once I and another man were with Sayyiduna Ibn Umar (may Allah be pleased with them). A man came, so Sayyiduna Ibn Umar (may Allah be pleased with them) said to both of us: "Move back a little, because the Prophet (peace and blessings be upon him) said: If there are three people, then two should not whisper to each other leaving the third one out."